NE555, NE555Y, SA555, SE555, SE555C
PRECISION TIMERS
SLFS022 – SEPTEMBER 1973 – REVISED FEBRUARY 1992
RESET
Low
High
High
High
TRIGGER VOLTAGE†
Irrelevant
< 1/3 VDD
> 1/3 VDD
> 1/3 VDD
FUNCTION TABLE
THRESHOLD VOLTAGE†
Irrelevant
Irrelevant
> 2/3 VDD
< 2/3 VDD
OUTPUT
Low
High
Low
DISCHARGE SWITCH
On
Off
On
As previously established
† Voltage levels shown are nominal.
functional block diagram
VCC
8
CONT
5
R
6
THRES
RESET
4
R
TRIG
R
1
GND
RESET can override TRIG, which can override THRES.
Pin numbers shown are for the D, JG, and P packages only.
2
ÎÎ
ÎÎ
2
POST OFFICE BOX 655303
Î Î
Î
R
S
1
R1
3
OUT
Î
7
DISCH
•
DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
